Converting AD security object to Exchange object

Hi all,

We have created Universal Security Groups in AD,then add members to the Group so they can get FULL or Send As permission in Shared mailboxes.In ECP Exchange doesnt see these Groups,so we have to use PowerShell to add those permissions.

Now we will migrate over 1k mailboxes to Exchange Online and as far as i know all permission will be gone,since these Security Groups are not Exchange Object.

Is there a way we can convert existing AD Object to Exchange Objects?

Thanks and sorry if posted in wrong section.

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